# INFINITY

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< cpp‎ | numeric‎ | math

Defined in header `<cmath>` |  |
#define INFINITY /*implementation defined*/ |  | (since C++11)

If the implementation supports floating-point infinities, the macro `INFINITY` expands to constant expression of type float which evaluates to positive or unsigned infinity.

If the implementation does not support floating-point infinities, the macro `INFINITY` expands to a positive value that is guaranteed to overflow a float at compile time, and the use of this macro generates a compiler warning.

### See also

isinf (C++11) | checks if the given number is infinite (function)
HUGE_VALFHUGE_VALHUGE_VALL (C++11)(C++11) | indicates the overflow value for float, double and long double respectively (macro constant)
has_infinity [static] | identifies floating-point types that can represent the special value "positive infinity" (public static member constant of `std::numeric_limits<T>`)
infinity [static] | returns the positive infinity value of the given floating-point type (public static member function of `std::numeric_limits<T>`)
C documentation for INFINITY

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